the whole code snippet can benefit greatly from being simplified:

use strict;
use warnings;

my @a = qw! / /home /var /tmp /var/tmp !;
my @b = map { chomp( my @x = `ls $_` ); [ @x ] } @a;

for my $i ( 0 .. $#a )
{
    print $a[ $i ], $i ? '/' : '', $b[ $i ][ $_ ], "\n\n" for 0 .. $#b
+;
}
[download]

Or perhaps better as:

use strict;
use warnings;

my @a = qw! / /home /var /tmp /var/tmp !;
my @b = map [ m!/$! ? <$_*> : <$_/*> ], @a;

print map "$_\n\n", @$_ for @b;
[download]

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